env_est.h - Android社区 - https://www.androidos.net.cn/

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
individually for the purpose of encoding or decoding bit streams in products that are compliant with
the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
software may already be covered under those patent licenses when it is used for those licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.

2.    COPYRIGHT LICENSE

Redistribution and use in source and binary forms, with or without modification, are permitted without
payment of copyright license fees provided that you satisfy the following conditions:

You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
your modifications thereto in source code form.

You must retain the complete text of this software license in the documentation and/or other materials
provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.

The name of Fraunhofer may not be used to endorse or promote products derived from this library without
prior written permission.

You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
software or your modifications thereto.

Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
and the date of any change. For modified versions of the FDK AAC Codec, the term
"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

3.    NO PATENT LICENSE

NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.

4.    DISCLAIMER

This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
or business interruption, however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of this software, even if
advised of the possibility of such damage.

5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief  Envelope estimation structs and prototypes  
*/
#ifndef __ENV_EST_H
#define __ENV_EST_H

#include "sbr_def.h"
#include "sbr_encoder.h" /* SBR econfig structs */
#include "ps_main.h"
#include "bit_sbr.h"
#include "fram_gen.h"
#include "tran_det.h"
#include "code_env.h"
#include "ton_corr.h"

typedef struct
{
  FIXP_DBL  *rBuffer[QMF_MAX_TIME_SLOTS];
  FIXP_DBL  *iBuffer[QMF_MAX_TIME_SLOTS];

FIXP_DBL  *p_YBuffer;

FIXP_DBL  *YBuffer[QMF_MAX_TIME_SLOTS];
  int        YBufferScale[2];

UCHAR envelopeCompensation[MAX_FREQ_COEFFS];
  UCHAR pre_transient_info[2];

int YBufferWriteOffset;
  int YBufferSzShift;
  int rBufferReadOffset;

int no_cols;
  int no_rows;
  int start_index;

int time_slots;
  int time_step;
}
SBR_EXTRACT_ENVELOPE;
typedef SBR_EXTRACT_ENVELOPE *HANDLE_SBR_EXTRACT_ENVELOPE;

struct ENV_CHANNEL
{
  SBR_TRANSIENT_DETECTOR sbrTransientDetector;
  SBR_CODE_ENVELOPE sbrCodeEnvelope;
  SBR_CODE_ENVELOPE sbrCodeNoiseFloor;
  SBR_EXTRACT_ENVELOPE sbrExtractEnvelope;

SBR_ENVELOPE_FRAME SbrEnvFrame;
  SBR_TON_CORR_EST   TonCorr;

struct SBR_ENV_DATA encEnvData;

int qmfScale;
  UCHAR fLevelProtect;
};
typedef struct ENV_CHANNEL *HANDLE_ENV_CHANNEL;

/************  Function Declarations ***************/

INT
FDKsbrEnc_CreateExtractSbrEnvelope (HANDLE_SBR_EXTRACT_ENVELOPE  hSbrCut,
                                    INT channel
                                   ,INT chInEl
                                   ,UCHAR* dynamic_RAM
                         );

INT
FDKsbrEnc_InitExtractSbrEnvelope (
                          HANDLE_SBR_EXTRACT_ENVELOPE hSbr,
                          int no_cols,
                          int no_rows,
                          int start_index,
                          int time_slots, int time_step, int tran_off,
                          ULONG statesInitFlag
                         ,int chInEl
                         ,UCHAR* dynamic_RAM
                         ,UINT sbrSyntaxFlags
                         );

void FDKsbrEnc_deleteExtractSbrEnvelope (HANDLE_SBR_EXTRACT_ENVELOPE hSbrCut);

typedef struct {
    FREQ_RES res[MAX_NUM_NOISE_VALUES];
    int maxQuantError;

} SBR_FRAME_TEMP_DATA;

typedef struct {
    const SBR_FRAME_INFO *frame_info;
    FIXP_DBL noiseFloor[MAX_NUM_NOISE_VALUES];
    SCHAR sfb_nrg_coupling[MAX_NUM_ENVELOPE_VALUES]; /* only used if stereomode = SWITCH_L_R_C */
    SCHAR sfb_nrg[MAX_NUM_ENVELOPE_VALUES];
    SCHAR noise_level_coupling[MAX_NUM_NOISE_VALUES]; /* only used if stereomode = SWITCH_L_R_C */
    SCHAR noise_level[MAX_NUM_NOISE_VALUES];
    UCHAR transient_info[3];
    UCHAR nEnvelopes;
} SBR_ENV_TEMP_DATA;

/*
 * Extract features from QMF data. Afterwards, the QMF data is not required anymore.
 */
void
FDKsbrEnc_extractSbrEnvelope1(
                   HANDLE_SBR_CONFIG_DATA    h_con,
                   HANDLE_SBR_HEADER_DATA    sbrHeaderData,
                   HANDLE_SBR_BITSTREAM_DATA sbrBitstreamData,
                   HANDLE_ENV_CHANNEL        h_envChan,
                   HANDLE_COMMON_DATA        cmonData,
                   SBR_ENV_TEMP_DATA   *eData,
                   SBR_FRAME_TEMP_DATA *fData
                    );

/*
 * Process the previously features extracted by FDKsbrEnc_extractSbrEnvelope1
 * and create/encode SBR envelopes.
 */
void
FDKsbrEnc_extractSbrEnvelope2(
                   HANDLE_SBR_CONFIG_DATA     h_con,
                   HANDLE_SBR_HEADER_DATA     sbrHeaderData,
                   HANDLE_PARAMETRIC_STEREO   hParametricStereo,
                   HANDLE_SBR_BITSTREAM_DATA  sbrBitstreamData,
                   HANDLE_ENV_CHANNEL         sbrEnvChannel0,
                   HANDLE_ENV_CHANNEL         sbrEnvChannel1,
                   HANDLE_COMMON_DATA         cmonData,
                   SBR_ENV_TEMP_DATA         *eData,
                   SBR_FRAME_TEMP_DATA       *fData,
                   int                        clearOutput
                   );

INT
FDKsbrEnc_GetEnvEstDelay(HANDLE_SBR_EXTRACT_ENVELOPE hSbr);

#endif

C++程序 | 225行 | 8.51 KB

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